US20170187314A1 - Switch reluctance motor wide speed-regulation range cross-control method - Google Patents

Switch reluctance motor wide speed-regulation range cross-control method Download PDF

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US20170187314A1
US20170187314A1 US15/300,102 US201515300102A US2017187314A1 US 20170187314 A1 US20170187314 A1 US 20170187314A1 US 201515300102 A US201515300102 A US 201515300102A US 2017187314 A1 US2017187314 A1 US 2017187314A1
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constant
reluctance motor
controller
const
chopper
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US9979342B2 (en
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Hao Chen
He Cheng
Zhou Yang
Qing Wang
Qianlong WANG
Weilong HUANG
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/0004—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
    • H02P23/0022—Model reference adaptation, e.g. MRAS or MRAC, useful for control or parameter estimation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/08—Reluctance motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/08—Reluctance motors
    • H02P25/086—Commutation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/08—Reluctance motors
    • H02P25/092—Converters specially adapted for controlling reluctance motors
    • H02P25/0925—Converters specially adapted for controlling reluctance motors wherein the converter comprises only one switch per phase
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/08—Reluctance motors
    • H02P25/098—Arrangements for reducing torque ripple
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/10—Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/08—Arrangements for controlling the speed or torque of a single motor

Definitions

  • the present invention relates to a method for cross control of wide speed regulation range of switched reluctance motor, and particularly to a speed regulating method applicable to switched reluctance motor systems with multiple phases and multiple topological structures.
  • Switched reluctance motor has a simple and firm structure, high reliability and robustness, large starting torque and wide speed regulation range, and maintains high efficiency in a wide working area of rotational speed and torque, but it usually adopts different control modes in a low speed section and a high speed section. It adopts current chopper control in the low speed section and it adopts angle position control in the high speed section.
  • cut-and-try method may be adopted to determine the turn-on angle and turn-off angle of switched reluctance motor at the switchover moment.
  • the two control modes have different turn-on angles and turn-off angles of switched reluctance motor at the switchover moment.
  • the object of the present invention is to provide a method for cross control of wide speed regulation range of switched reluctance motor including low, medium and high rotational speed to tackle the problems in the prior art and to realize automatic switchover and seamless connection between current chopper control and angle position control.
  • the method for cross control of wide speed regulation range of switched reluctance motor comprises a control system consisting of a revolving speed regulator, a current chopper controller, an angle position controller, a chopper counter, a comparison selector and two settable constant registers including Up_const and Down_const., Current chopping limit i ref and turn-on angle ⁇ on and turn-off angle ⁇ off of power converter master switch are regulated through the speed regulator.
  • the chopper counter counts current chopping number of each electrical period.
  • the comparison selector selects the current chopper controller or the angle position controller.
  • the constant value set by constant register Up_const is larger than the constant value set by constant register Down_const.
  • the count value of the chopper counter is compared with the constant value set by constant register Up_const and the constant value set by constant register Down_const.
  • the comparison selector selects the current chopper controller, and the speed regulator raises current chopping limit to increase the rotational speed of switched reluctance motor; when the count value of the chopper counter is smaller than the constant value set by constant register Down_const, the comparison selector selects the angle position controller, and the speed regulator moves the value of turn-on angle forward to raise the rotational speed of switched reluctance motor;
  • the comparison selector selects the current chopper controller, and the speed regulator lowers current chopping limit to reduce the rotational speed of switched reluctance motor; when the count value of the chopper counter is smaller than the constant value set by constant register Down_const or larger than the constant value set by constant register Up_const, the comparison selector selects the angle position controller, and the speed regulator moves the value of turn-on angle backward to reduce the rotational speed of switched reluctance motor;
  • the controller selected by the comparison selector is the controller adopted at the moment before switched reluctance motor enters a stage of running at a constant speed.
  • the type of the controller remains unchanged.
  • the present invention realizes speed adjustable operation of switched reluctance motor systems with multiple phases and multiple topological structures in a wide range of rotational speed, including low, medium and high speed. It ensures automatic switchover and seamless connection between current chopper control and angle position control during three stages: low rotational speed, medium rotational speed and high rotational speed and during operation at an accelerated, decelerated or constant speed without being affected by load change. The switchover of turn-on angle and turn-off angle will not cause fluctuation of torque or rotational speed of switched reluctance motor.
  • the switched reluctance motor system works stably and has a good engineering application value.
  • FIG. 1 is a structural schematic of the control system provided by the present invention
  • FIG. 2 is a schematic showing the present invention automatically divides speed regulation range into three stages: low, medium and high rotational speed.
  • the method for cross control of wide speed regulation range of switched reluctance motor makes use of a system for cross control of wide speed regulation range of switched reluctance motor.
  • the system consists of a speed regulator, a current chopper controller, an angle position controller, a chopper counter, a comparison selector and two settable constant registers including Up_const and Down_const.
  • Current chopping limit i ref and turn-on angle ⁇ on and turn-off angle ⁇ off of power converter master switch are regulated through the speed regulator.
  • the chopper counter counts current chopping number of each electrical period.
  • the comparison selector selects the current chopper controller or the angle position controller.
  • the constant value set by constant register Up_const is larger than the constant value set by constant register Down_const.
  • the count value of the chopper counter is compared with the constant value set by constant register Up_const and the constant value set by constant register Down_const.
  • the preset rotational speed n ref is regulated:
  • the method for cross control of wide speed regulation range of switched reluctance motor automatically divides the speed regulation range of switched reluctance motor system into three stages: low, medium and high rotational speed.
  • the current chopper controller In the low rotational speed section below base speed, the current chopper controller is adopted; in the medium rotational speed section, the current chopper controller and the angle position controller are adopted for cross control; in the high speed section, the angle position controller is adopted.
  • the method ensures automatic switchover and seamless connection between current chopper control and angle position control in three stages: low rotational speed, medium rotational speed and high rotational speed and during operation at an accelerated, decelerated or constant speed without being affected by load change.
  • the switchover of turn-on angle and turn-off angle will not cause fluctuation of torque or rotational speed of switched reluctance motor.
  • the switched reluctance motor system works stably.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

A switch reluctance motor wide speed-regulation range cross-control method, the switch reluctance motor wide speed-regulation range control system consisting of a revolving speed regulator, a current chopper controller, an angle position controller, a chopper counter, a comparison selector and two resettable constant registers; the chopper counter counts the current chopping number of each electrical period, and according to the comparison result between a counting value of the chopper counter and a constant value set by the two constant registers, the comparison selector selects the current chopper controller or the angle positon controller, such that when in the three phases of low revolving speed, medium revolving speed and high revolving speed or in the runtime of acceleration, deceleration and uniform velocity, the current chopper controller and the angle positon controller can automatically switch, and seamlessly connect without being affected by load change, and switching from a turn-on angle to a turn-off angle will not cause fluctuation of torque or revolving speed of a switch reluctance motor, thus the switch reluctance motor system runs stably and has good value for engineering application.

Description

    FIELD OF THE INVENTION
  • The present invention relates to a method for cross control of wide speed regulation range of switched reluctance motor, and particularly to a speed regulating method applicable to switched reluctance motor systems with multiple phases and multiple topological structures.
    • BACKGROUND OF THE INVENTION
  • Switched reluctance motor has a simple and firm structure, high reliability and robustness, large starting torque and wide speed regulation range, and maintains high efficiency in a wide working area of rotational speed and torque, but it usually adopts different control modes in a low speed section and a high speed section. It adopts current chopper control in the low speed section and it adopts angle position control in the high speed section. When load is constant, in order to assure smooth switchover between the two control modes, cut-and-try method may be adopted to determine the turn-on angle and turn-off angle of switched reluctance motor at the switchover moment. However, when load is changed, the two control modes have different turn-on angles and turn-off angles of switched reluctance motor at the switchover moment. Improper switchover of turn-on angle and turn-off angle will cause fluctuation of torque or rotational speed of switched reluctance motor and make speed regulating system of switched reluctance motor be unable to work stably. How to realize automatic switchover and seamless connection between the two control modes and eliminate switchover jittering is one of the important directions for technological breakthrough of current switched reluctance motor systems.
    • SUMMARY OF THE INVENTION
  • The object of the present invention is to provide a method for cross control of wide speed regulation range of switched reluctance motor including low, medium and high rotational speed to tackle the problems in the prior art and to realize automatic switchover and seamless connection between current chopper control and angle position control.
  • The method for cross control of wide speed regulation range of switched reluctance motor provided by the present invention comprises a control system consisting of a revolving speed regulator, a current chopper controller, an angle position controller, a chopper counter, a comparison selector and two settable constant registers including Up_const and Down_const., Current chopping limit iref and turn-on angle θon and turn-off angle θoff of power converter master switch are regulated through the speed regulator. The chopper counter counts current chopping number of each electrical period. The comparison selector selects the current chopper controller or the angle position controller. In the two settable constant registers, the constant value set by constant register Up_const is larger than the constant value set by constant register Down_const. The count value of the chopper counter is compared with the constant value set by constant register Up_const and the constant value set by constant register Down_const.
  • during acceleration stage of switched reluctance motor, when the count value of the chopper counter is larger than the constant value set by constant register Down_const, the comparison selector selects the current chopper controller, and the speed regulator raises current chopping limit to increase the rotational speed of switched reluctance motor; when the count value of the chopper counter is smaller than the constant value set by constant register Down_const, the comparison selector selects the angle position controller, and the speed regulator moves the value of turn-on angle forward to raise the rotational speed of switched reluctance motor;
  • during deceleration stage of switched reluctance motor, when the count value of the chopper counter is larger than the constant value set by constant register Down_const and smaller than the constant value set by constant register Up_const, the comparison selector selects the current chopper controller, and the speed regulator lowers current chopping limit to reduce the rotational speed of switched reluctance motor; when the count value of the chopper counter is smaller than the constant value set by constant register Down_const or larger than the constant value set by constant register Up_const, the comparison selector selects the angle position controller, and the speed regulator moves the value of turn-on angle backward to reduce the rotational speed of switched reluctance motor;
  • when switched reluctance motor enters a stage of running at a constant speed, the controller selected by the comparison selector is the controller adopted at the moment before switched reluctance motor enters a stage of running at a constant speed. The type of the controller remains unchanged.
  • Beneficial effect: The present invention realizes speed adjustable operation of switched reluctance motor systems with multiple phases and multiple topological structures in a wide range of rotational speed, including low, medium and high speed. It ensures automatic switchover and seamless connection between current chopper control and angle position control during three stages: low rotational speed, medium rotational speed and high rotational speed and during operation at an accelerated, decelerated or constant speed without being affected by load change. The switchover of turn-on angle and turn-off angle will not cause fluctuation of torque or rotational speed of switched reluctance motor. The switched reluctance motor system works stably and has a good engineering application value.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a structural schematic of the control system provided by the present invention;
  • FIG. 2 is a schematic showing the present invention automatically divides speed regulation range into three stages: low, medium and high rotational speed.
    •  DETAILED DESCRIPTION OF THE EMBODIMENTS
  • The embodiments of the present invention are further described by referring to the following accompanying drawings:
  • As shown in FIG. 1, the method for cross control of wide speed regulation range of switched reluctance motor provided by the present invention makes use of a system for cross control of wide speed regulation range of switched reluctance motor. The system consists of a speed regulator, a current chopper controller, an angle position controller, a chopper counter, a comparison selector and two settable constant registers including Up_const and Down_const. Current chopping limit iref and turn-on angle θon and turn-off angle θoff of power converter master switch are regulated through the speed regulator. The chopper counter counts current chopping number of each electrical period. The comparison selector selects the current chopper controller or the angle position controller. In the two settable constant registers, the constant value set by constant register Up_const is larger than the constant value set by constant register Down_const. The count value of the chopper counter is compared with the constant value set by constant register Up_const and the constant value set by constant register Down_const. The preset rotational speed nref is regulated:
    • a) During the acceleration stage, switched reluctance motor is accelerated from low rotational speed to high rotational speed. When switched reluctance motor runs below base speed, back electromotive force is small. When current chopper control is adopted, chopping times are large; when the count value of the chopper counter is larger than the constant value set by constant register Down_const, the comparison selector selects the current chopper controller, and the speed regulator raises current chopping limit to increase the rotational speed of switched reluctance motor; when the count value of the chopper counter is smaller than the constant value set by constant register Down_const, the comparison selector selects the angle position controller, and the speed regulator moves the value of turn-on angle forward to raise the rotational speed of switched reluctance motor; if the count value of the chopper counter is larger than the constant value set by constant register Down_const again after the value of turn-on angle is moved forward, the comparison selector will switch to the current chopper controller again, and the speed regulator will raise current chopping limit to increase the rotational speed of switched reluctance motor; if the count value of the chopper counter is smaller than the constant value set by constant register Down_const again, the comparison selector will switch to the angle position controller again, and the speed regulator will move the value of turn-on angle forward to raise the rotational speed of switched reluctance motor. When switched reluctance motor runs at a high speed, back electromotive force is large, the current does not reach chopping limit, the count value of the chopper counter is always smaller than the constant value set by constant register Down_const, the comparison selector always selects the angle position controller, and the speed regulator moves the value of turn-on angle forward to raise the rotational speed of switched reluctance motor.
    • b) during the deceleration stage, switched reluctance motor is decelerated from high rotational speed to low rotational speed. When switched reluctance motor runs at a high speed, back electromotive force is large, current does not reach chopping limit, the count value of the chopper counter is always smaller than the constant value set by constant register Down_const, the comparison selector selects the angle position controller, and the speed regulator moves the value of turn-on angle backward to reduce the rotational speed of switched reluctance motor. Following the reduction of the rotational speed of switched reluctance motor, back electromotive force decreases and the count value of the chopper counter increases gradually; when the count value of the chopper counter is larger than the constant value set by constant register Down_const and smaller than the constant value set by constant register Up_const, the comparison selector selects the current chopper controller, and the speed regulator lowers current chopping limit to reduce the rotational speed of switched reluctance motor. Thereafter, chopping times increase gradually, and the count value of the chopper counter increases gradually. When the count value of the chopper counter is larger than the constant value set by constant register Up_const, the comparison selector selects the angle position controller, and the speed regulator moves the value of turn-on angle backward to reduce the rotational speed of switched reluctance motor; following the backward movement of the value of turn-on angle, the count value of the chopper counter is smaller than the constant value set by constant register Up_const again, but larger than the constant value set by constant register Down_const, the comparison selector selects the current chopper controller, and the speed regulator lowers current chopping limit to reduce the rotational speed of switched reluctance motor; if the count value of the chopper counter is smaller than the constant value set by constant register Down_const, the comparison selector will select the angle position controller, and the speed regulator will move the value of turn-on angle backward to reduce the rotational speed of switched reluctance motor; if the count value of the chopper counter is larger than the constant value set by constant register Up_const, the comparison selector will also select the angle position controller, and the speed regulator will move the value of turn-on angle backward to reduce the rotational speed of switched reluctance motor; after the rotational speed of switched reluctance motor is reduced to below base speed, the comparison selector will always select the current chopper controller, and the speed regulator will lower current chopping limit to reduce the rotational speed of switched reluctance motor;
    • c) During the stage of running at a constant speed, the controller selected by the comparison selector is the controller adopted at the moment before switched reluctance motor enters a stage of running at a constant speed. The type of the controller remains unchanged. The speed regulator regulates current chopping limit or the value of turn-on angle, and keeps the rotational speed of switched reluctance motor unchanged.
  • As shown in FIG. 2, the method for cross control of wide speed regulation range of switched reluctance motor automatically divides the speed regulation range of switched reluctance motor system into three stages: low, medium and high rotational speed. In the low rotational speed section below base speed, the current chopper controller is adopted; in the medium rotational speed section, the current chopper controller and the angle position controller are adopted for cross control; in the high speed section, the angle position controller is adopted. The method ensures automatic switchover and seamless connection between current chopper control and angle position control in three stages: low rotational speed, medium rotational speed and high rotational speed and during operation at an accelerated, decelerated or constant speed without being affected by load change. The switchover of turn-on angle and turn-off angle will not cause fluctuation of torque or rotational speed of switched reluctance motor. The switched reluctance motor system works stably.

Claims (1)

1. A method for cross control of wide speed regulation range of switched reluctance motor, comprising a control system consisting of a speed regulator, a current chopper controller, an angle position controller, a chopper counter, a comparison selector and two settable constant registers including Up_const and Down_const, characterized in that current chopping limit iref and turn-on angle θon and turn-off angle θoff of power converter master switch are regulated through the speed regulator; the chopper counter counts current chopping number of each electrical period; the comparison selector selects the current chopper controller or the angle position controller; in the two settable constant registers, the constant value set by constant register Up_const is larger than the constant value set by constant register Down_const; the count value of the chopper counter is compared with the constant value set by constant register Up_const and the constant value set by constant register Down_const;
during acceleration stage switched reluctance motor, when the count value of the chopper counter is larger than the constant value set by constant register Down_const, the comparison selector selects the current chopper controller, and the speed regulator raises current chopping limit to increase the rotational speed of switched reluctance motor; when the count value of the chopper counter is smaller than the constant value set by constant register Down_const, the comparison selector selects the angle position controller, and the speed regulator moves the value of turn-on angle forward to raise the rotational speed of switched reluctance motor;
during deceleration stage switched reluctance motor, when the count value of the chopper counter is larger than the constant value set by constant register Down_const and smaller than the constant value set by constant register Up_const, the comparison selector selects the current chopper controller, and the speed regulator lowers current chopping limit to reduce the rotational speed of switched reluctance motor; when the count value of the chopper counter is smaller than the constant value set by constant register Down_const or larger than the constant value set by constant register Up_const, the comparison selector selects the angle position controller, and the speed regulator moves the value of turn-on angle backward to reduce the rotational speed of switched reluctance motor;
when switched reluctance motor enters a stage of running at a constant speed, the controller selected by the comparison selector is the controller adopted at the moment before switched reluctance motor enters a stage of running at a constant speed; the type of the controller remains unchanged.
US15/300,102 2014-10-30 2015-10-16 Switch reluctance motor wide speed-regulation range cross-control method Active US9979342B2 (en)

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CN201410605005.7 2014-10-30
CN201410605005 2014-10-30
CN201410605005.7A CN104333275B (en) 2014-10-30 2014-10-30 A kind of switched reluctance machines wide speed regulating range cross-over control method
PCT/CN2015/092049 WO2016066025A1 (en) 2014-10-30 2015-10-16 Switch reluctance motor wide speed-regulation range cross-control method

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